The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
12 Days of Christmas in Python in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 798th humz2k 349 544 10ms 5 Jul 2022 798th AharonSambol 349 544 16ms 18 Aug 2023 798th AthiraPillai123 349 544 9ms 4 Jan 2024 798th multikatt 349 544 9ms 13 Jan 2026 798th davidludwik2370 349 544 10ms 21 days ago 806th dzshn 349 545 10ms 25 Nov 2020 806th jellybro99 349 545 9ms 15 Oct 2021 806th StoverGitHub 349 545 11ms 16 Jun 2022 806th Bananapants22 349 545 9ms 15 Aug 2022 806th bedwards 349 545 10ms 13 Jan 2025 811th llysnafedd 348 546 10ms 28 Aug 2020 811th alexstarosta 348 546 10ms 27 Jun 2024 811th kyleyarwood 348 546 9ms 4 Oct 2024 811th jwfiredragon 348 546 11ms 15 May 2025 815th smf0x10 347 547 10ms 3 Oct 2021 815th Eilonlif 🇮🇱 347 547 10ms 25 Dec 2022 815th b20fuji 347 547 10ms 18 Oct 2023 815th Amy-Checcllo 347 547 9ms 22 Sep 2024 815th GeorgeStatho 347 547 11ms 5 Aug 2025 820th DylanScottCarroll 347 548 10ms 8 Nov 2021 820th RubiksImplosion 347 548 10ms 4 Dec 2022 820th felixcroc 347 548 11ms 1 Apr 2023 820th epic-programmer-guy 347 548 10ms 29 Dec 2023 820th MassimoParisi 347 548 16ms 24 Sep 2024 820th Shotokhan 347 548 10ms 15 Sep 2025 820th Evytag 🇫🇷 347 548 10ms 9 Oct 2025 827th afyber 346 549 9ms 26 Jun 2019 827th my1e5 346 549 9ms 29 Nov 2021 827th oakesy 346 549 10ms 19 May 2024 827th CyberTapir 346 549 10ms 30 Aug 2024 827th martindotexe 🇳🇴 346 549 17ms 15 Feb 2025 827th shawncrabtree 346 549 10ms 21 Jun 2025 827th Sharrrkkk 346 549 10ms 21 Jul 2025 834th Esterfox610 345 550 10ms 17 Aug 2022 834th llama1024 345 550 10ms 5 Dec 2022 834th lorienaquarius 345 550 10ms 31 Dec 2023 837th eoinfennessy 345 551 10ms 21 Jul 2021 837th micah-weitzman 345 551 10ms 27 Jul 2021 837th mehekj 345 551 10ms 29 Jul 2021 837th No-Jons 345 551 9ms 23 May 2022 841st Parapet128 344 552 9ms 17 Jan 2019 841st dillon-duncando 344 552 10ms 19 Dec 2021 841st nmougino 🇫🇷 344 552 17ms 31 May 2022 841st Vaibhav0460 344 552 10ms 16 Feb 2024 841st navier-1 344 552 10ms 15 Sep 2025 841st kasarino 344 552 10ms 30 Nov 2025 847th aazuspan 344 553 10ms 24 Nov 2021 847th leeyonjae 344 553 11ms 10 Dec 2023 847th jjkochan2 344 553 9ms 17 Jan 2025 850th carsonsyberg 343 554 11ms 9 May 2022 851st Alexander-Francis 342 555 10ms 10 Jul 2019 851st itiievskyi 🇺🇦 342 555 10ms 10 Aug 2020 851st KasperKivimaeki 🇫🇮 342 555 10ms 20 Nov 2025 851st pingpwn 342 555 10ms 14 Feb 2026 855th dddthedark 342 556 10ms 21 Jun 2019 855th ejerrard 342 556 10ms 27 Aug 2020 855th robertovers 342 556 14ms 29 Sep 2023 855th imnotAlexKnight 342 556 10ms 10 Jul 2025 855th rahulbyte-js 342 556 10ms 25 Nov 2025 860th amadeusdotpng 341 558 10ms 22 Apr 2023 860th iliao2345 341 558 10ms 8 Jul 2025 862nd lmolteno 340 559 10ms 3 Mar 2021 862nd jmath3912 340 559 10ms 26 Apr 2024 864th estomagordo 🇳🇱 339 560 10ms 3 Aug 2019 864th gautambp 339 560 18ms 22 Jun 2025 864th iilegacyyii 339 560 17ms 30 Dec 2025 867th kalpanasuresh 339 561 10ms 26 Mar 2021 867th luxdragon 339 561 10ms 11 Oct 2022 867th falinos 339 561 10ms 1 Jan 2023 867th andyxukq 339 561 10ms 4 Feb 2025 871st zgialor-lab 338 562 10ms 19 days ago 872nd fl3ur1nestimable 337 563 10ms 28 Mar 2022 873rd NuqieNoila 337 564 9ms 1 Feb 2019 873rd bwenstar 337 564 10ms 9 Aug 2022 873rd Saaxxx 337 564 10ms 22 Aug 2023 876th MiranDaniel 🇨🇿 336 565 17ms 30 Aug 2023 876th pquline 336 565 9ms 5 Mar 2025 878th artur-py 336 566 10ms 16 Dec 2022 878th skarabb 336 566 10ms 26 Mar 2024 880th CRHillman 335 568 10ms 14 Aug 2018 First Prev 801–880 of 1,169 Next Last
